What were the origins of slavery ​

Sumer and ancient civilizations.

Explanation:

The origins of slavery ​were Sumer and ancient civilizations. Slavery occurred in civilizations of Sumer, as well as in almost every ancient civilization, such as ancient Egypt, ancient China, the Akkadian Empire, Assyria, Babylonia, Persia, ancient Greece, ancient India, the Roman Empire, the Arab Islamic Caliphate and Sultanate and the pre-Columbian etc. The slavery was started because there is need for it in every society and civilization for the purpose of work.

answer is b.

  it is always the best policy to have good communication and good relations between individuals and, specially, between leaders of the countries. for this purpose, among others, there is a common place, the united nations, where the representants can present his and learn about the other country's policies.